<!DOCTYPE html>
<html>
  <head>
    <link rel='match' href='percent_height_ref.html'>
    <style type="text/css">
      .outer {
        background: red;
        width: 100px;
        height: 100px;
      }
      .inner {
        background: green;
        width: 100%;
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div class="outer">
      <div class="inner"></div>
    </div>
  </body>
</html>
